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- W2316734146 abstract "Single-crystal magnetic susceptibilities of triclinic ${mathrm{Cs}}_{2}$Mn${mathrm{Cl}}_{4}$ifmmodecdotelsetextperiodcenteredfi{}2${mathrm{H}}_{2}$O have been measured between 0.35 and 20ifmmode^circelsetextdegreefi{}K. Over this interval the susceptibility exhibits a uniaxial anisotropy about a direction parallel to the O-Mn-O axis of each octahedral complex ${[mathrm{M}mathrm{n}{mathrm{Cl}}_{4}mathrm{ifmmodecdotelsetextperiodcenteredfi{}}2{mathrm{H}}_{2}mathrm{O}]}^{2ensuremath{-}}$. The temperature variations of ${ensuremath{chi}}_{mathrm{II}}$ and ${ensuremath{chi}}_{ensuremath{perp}}$ are those of a uniaxial antiferromagnet with ${T}_{N}=1.8ifmmode^circelsetextdegreefi{}$K and the preferred direction of spin alignment along or near the O-Mn-O axis. Quantitative estimates of the magnetic dipolar anisotropy indicate it to be an order of magnitude too small to account for the observations above ${T}_{N}$. This anisotropy can be described by a term $D{{S}_{z}}^{2}$ in the single-ion Hamiltonian with $D=ensuremath{-}0.1$ ${mathrm{cm}}^{ensuremath{-}1}$. In the ordered state, this relatively large anisotropy produces a gap $k{T}_{mathrm{AE}}$, in the spin-wave spectrum with an estimated ${T}_{mathrm{AE}}ensuremath{approx}1.6ifmmode^circelsetextdegreefi{}$K. A gap of roughly this magnitude is suggested by the temperature variation of ${ensuremath{chi}}_{mathrm{II}}$ below 1ifmmode^circelsetextdegreefi{}K. The nearest-neighbor exchange coupling is estimated to be $zJ=ensuremath{-}0.54$k." @default.
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- W2316734146 date "1969-01-10" @default.
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- W2316734146 title "Antiferromagnetism of<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>Cs</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>Mn<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>Cl</mml:mi></mml:mrow><mml:mrow><mml:mn>4</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>·2<mml:math xmlns:mml…" @default.
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- W2316734146 doi "https://doi.org/10.1103/physrev.177.1012" @default.
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